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LTC3216EDE#PBF

P1-P3P4-P6P7-P9P10-P12
LTC3216
1
3216fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1A Low Noise High Current
LED Charge Pump with
Independent Torch/Flash Current Control
The LTC
®
3216 is a low noise, high current charge pump
DC/DC converter designed to power high current LEDs.
The part includes an accurate programmable current
source capable of driving loads up to 1A from a 2.9V to
4.4V input. Low external parts count (two fl ying capacitors,
two programming resistors and two bypass capacitors at
V
IN
and CPO) make the LTC3216 ideally suited for small,
battery-powered applications.
Built-in soft-start circuitry prevents excessive inrush cur-
rent during start-up. High switching frequency enables
the use of small external capacitors. Independent high
and low current settings are programmed by two external
resistors. Shutdown mode and current output levels are
selected via two logic inputs.
An ultralow dropout current source maintains accurate
LED current at very low I
LED
voltages. Automatic mode
switching optimizes effi ciency by monitoring the voltage
across the LED current source and switching modes only
when I
LED
dropout is detected. The LTC3216 is available
in a small 3mm × 4mm 12-Lead DFN package.
Torch Mode Effi ciency vs V
IN
n
High Effi ciency Operation: 1x, 1.5x or 2x Boost
Modes with Automatic Mode Switching
n
Ultralow Dropout I
LED
Current Control
n
Output Current up to 1A
n
Low Noise Constant Frequency Operation
n
Independent Low Current/High Current
Programming and Enable Pins
n
Wide V
IN
Range: 2.9V to 4.4V
n
Open/Shorted LED Protection
n
LED Disconnect in Shutdown
n
Low Shutdown Current: 2.5µA
n
4% LED Current Programming Accuracy
n
Automatic Soft-Start Limits Inrush Current
n
No Inductors
n
Tiny Application Circuit (All Components <1mm
Profi le)
n
3mm × 4mm 12-Lead DFN Package
n
LED Torch/Camera Light Supply for Cell Phones,
PDAs and Digital Cameras
n
Generic Lighting and/or Flash/Strobe Applications
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6411531.
EN1
0
1
0
1
C1
2.2µF
C2
2.2µF
C
IN
2.2µF
C
CPO
4.7µF
LED1
I
LED
V
IN
2.9V TO 4.4V
EN2
EN1
LTC3216
C1
+
C1
–
C2
+
C2
–
I
SET1
I
SET2
0 (SHUTDOWN)
200mA (TORCH)
600mA
800mA (FLASH)
EN2
0
0
1
1
3216 TA01a
LED1: LUMILEDS LXCL-PWF1 LUXEON FLASH
CPO
20k
1%
6.65k
1%
EN2 (FLASH)
EN1 (TORCH)
I
LED
V
IN
(V)
2.8
EFFICIENCY (P
LED
/PIN) (%)
100
90
80
70
60
50
40
30
20
10
0
3.2
3.6
3.8
3216 TA01b
3.0 3.4
4.0
4.2
4.4
P
LED
/PIN
LUMILEDS LXCL-PWF1
V
F
= 3V TYP AT 200mA
I
LED
= 200mA
LTC3216
2
3216fc
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
V
IN
to GND ................................................ –0.3V to 5.5V
CPO to GND .............................................. –0.3V to 5.5V
EN2, EN1 ...........................................–0.3V to V
IN
+ 0.3V
I
CPO
, I
ILED
(Note 2) .............................................1500mA
CPO Short-Circuit Duration .............................. Indefi nite
Operating Temperature Range (Note 3).... –40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
12
11
10
9
8
7
1
2
3
4
5
6
C1
–
GND
C2
–
VIN
EN2
EN1
C2
+
C1
+
CPO
I
SET1
I
LED
I
SET2
TOP VIEW
DE12 PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
EXPOSED PAD IS GND (PIN 13)
MUST BE SOLDERED TO PCB
13
T
JMAX
= 125°C, θ
JA
= 43°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3216EDE#PBF LTC3216EDE#TRPBF 3216
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, C
IN
= C1 = C2 = 2.2μF, C
CPO
= 4.7μF.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Power Supply
V
IN
Operating Voltage
●
2.9 4.4 V
I
VIN
Operating Current I
CPO
= 0mA, 1x Mode
I
CPO
= 0mA, 1.5x
I
CPO
= 0mA, 2x Mode
300
7
9.2
µA
mA
mA
I
VIN
Shutdown Current EN2 = EN1 = LOW 2.5 7 µA
LED Current
LED Current Ratio (I
LED
/I
SET1/2
)I
LED
= 200mA to 800mA
●
3120 3250 3380 mA/mA
I
LED
Dropout Voltage Mode Switch Threshold, I
LED
= 200mA 120 mV
Mode Switching Delay
(LED Warmup Time)
EN1 = HIGH, EN2 = LOW
EN1 = LOW or HIGH, EN2 = HIGH
150
2
ms
ms
LED Current On Time
EN
to LED Current On
130 µs
Charge Pump (CPO)
1x Mode Output Voltage I
CPO
= 0mA V
IN
V
1.5x Mode Output Voltage I
CPO
= 0mA 4.6 V
2x Mode Output Voltage I
CPO
= 0mA 5.1 V
1x Mode Output Impedance 0.25
1.5x Mode Output Impedance V
IN
= 3.4V, V
CPO
< 4.6V, C1 = C2 = 2.2µF 1.5
LTC3216
3
3216fc
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based on long-term current density limitations. Assumes an
operating duty cycle of ≤ 10% under absolute maximum conditions for
durations less than 10 seconds. Max current for continuous operation is
500mA.
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, C
IN
= C1 = C2 = 2.2μF, C
CPO
= 4.7μF.
Note 3: The LTC3216E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
I
LED
Dropout Voltage
vs LED Current
I
LED
Pin Current
vs I
LED
Pin Voltage I
LED
vs R
SET
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise specifi ed)
PARAMETER CONDITIONS MIN TYP MAX UNITS
2x Mode Output Impedance V
IN
= 3.2V, V
CPO
< 5.1V, C1 = C2 = 2.2µF 1.7
CLK Frequency
●
0.6 0.9 1.2 MHz
CPO Short-Circuit Detection
Threshold Voltage EN1/EN2 = High
●
0.5 1.5 V
Test Current EN1 = EN2 = Low, V
CPO
= 0V
●
10 30 mA
EN1, EN2
High Level Input Voltage (V
IH
)
●
1.4 V
Low Level Input Voltage (V
IL
)
●
0.4 V
Input Current (I
IH
)
●
–1 1 µA
Input Current (I
IL
)
●
–1 1 µA
I
SET1
, I
SET2
V
ISET1
, V
ISET2
I
SETX
= 50µA
●
1.195 1.22 1.245 V
I
ISET1
, I
ISET2
●
321 µA
LED CURRENT (mA)
0 200
DROPOUT VOLTAGE (V)
400 800600
1000
3216 G01
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
IN
= 3.6V
I
LED
PIN VOLTAGE (V)
0
I
LED
PIN CURRENT (mA)
600
500
400
300
200
100
0
0.2 0.4 0.6 0.8
3216 G02
1.0
I
LED
= 500mA
400mA
300mA
200mA
100mA
R
SET
(kΩ)
I
LED
(mA)
1573 G03
1200
1000
800
600
400
200
0
0
10
20
25
515
30
35
40
P1-P3P4-P6P7-P9P10-P12

LTC3216EDE#PBF

Mfr. #:
Buy LTC3216EDE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 1A L N Hi C LED Ch Pump w/ Independent T
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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